Designed by John Mauchly and J. Presper Eckert, the Electronic Numerical Integrator And Computer was the first general-purpose electronic computer. It was used to calculate artillery firing tables for the US Army's Ballistic Research Laboratory, but it was first used in calculations for the hydrogen bomb. The ENIAC's design and construction was financed by the US Army during WWII. Not only could it add and subtract, but it could also hold a ten-digit decimal number in its memory. The ENIAC was very large in size, and was very complex. It consumed 150 kW of power and ten-position ring counters to store digits. Pulses from the ring counters were counted in order to perform arithmetic. It performed equations at an extremely fast pace.
